Position-dependent gaming, 3-d controller, and handheld as a remote

ABSTRACT

Methods and systems for using a position of a mobile device with an integrated display as an input to a video game or other presentation are presented. Embodiments include rendering an avatar on a mobile device such that it appears to overlay a competing user in the real world. Using the mobile device&#39;s position, view direction, and the other user&#39;s mobile device position, an avatar (or vehicle, etc.) is depicted at an apparently inertially stabilized location of the other user&#39;s mobile device or body. Some embodiments may estimate the other user&#39;s head and body positions and angles and reflect them in the avatar&#39;s gestures.

CROSS-REFERENCES TO RELATED APPLICATIONS

This application is related to U.S. Pat. No. ______, (Attorney Docket No.: 026340-007200US), entitled “OVERLAY VIDEO CONTENT ON A MOBILE DEVICE”, filed concurrently herewith, and U.S. Pat. No. ______, (Attorney Docket No.: 026340-007300US), entitled “SUPPLEMENTAL VIDEO CONTENT ON A MOBILE DEVICE”, filed concurrently herewith, each of which is incorporated by reference herein in their entirety for all purposes.

BACKGROUND

1. Field of the Invention

Embodiments of the present invention relate to video display and video game entertainment devices in general and, in particular, to the rendering of avatars, vehicles, game pieces, etc. on a user's mobile device based on its look angle and/or position with respect to another user's mobile device and/or a fixed video display.

2. Description of the Related Art

Video games are typically played by users sitting in front of a video screen. Multi-player video games are often played by users sitting in front of a common, shared video screen. The shared video screen is sometimes a large television that is connected with a video game console, such as a Sony PlayStation® 3. Wired or wireless game controllers serve as input devices to send commands from the users to the console. In some instances, data is sent from the console to the controllers to, for example, switch on and off lights on a controller, give tactile signals (e.g. force feedback) to the user, calibrate the controllers, etc.

Networked multi-player games are often played by users sitting in front of their own, personal video screens. These video games are often played from a personal computer (PC) or a video game console using a keyboard or game controllers described above. Some networked multi-player games are played from a portable handheld, smart phone, or other mobile device with its own embedded display, such as a Sony PlayStation Portable® (PSP). The display shares the same plastic housing with buttons, joysticks, rollerballs, trigger switches, and/or other input components. Some displays that are touch or stylus-sensitive also serve as input devices in addition to or in conjunction with physical buttons, etc.

To play a handheld game on a mobile device with an integrated display, a user sometimes stares down into his screen without moving. Some players attempt to stay as motionless as possible, avoiding jarring by others around them, in order to concentrate and maintain hand-eye coordination to correctly select inputs in response to the game. This head-down, motionless poise can make for a solitary experience, even when a user is playing against another human opponent. Even if the opposing, or cooperating, players are seated next to each other, physical interaction between the players can be minimal because they look with their heads down at their screens instead of toward each other. This heads-down posture can also result in getting motion sickness if one in a moving vehicle such as an automobile.

There may, therefore, be a need in the art to allow players of single-player games to better interact with their physical surroundings and players of multi-player games to better interact with one another while playing against each other.

BRIEF SUMMARY

Methods, systems, and devices are presented for augmenting video using a relative distance and direction of a mobile display from a fixed display. Movement of the mobile display can be used as an input to a video game and/or to help render graphics associated with the video game. For example, a user driving a video game jeep through a jungle may have a view out the front windshield of the jeep from a fixed display and be able to slew his mobile device up and around to look at things above and behind him in the virtual jungle.

Methods, systems, and devices are described for displaying augmented video on a display integrated in a mobile device held or worn by a first user based on the relative position of another user's mobile device and view direction of the first user's mobile device. In some embodiments, a user can hold up his device in the direction of another user and see an avatar of the other user on the display apparently at the same position in space as the other user. This can give the appearance that the user's display is simply a transparent window with the exception that his opponent's physical body is overlaid with the graphical body of an avatar.

In some embodiments, the mobile devices can be calibrated so that the position of the other user's head, body, etc. are estimated from the orientation and motion of his device so that the avatar's head, body, etc. appear at the same position as the other user. In some embodiments, face and motion tracking of a user's head, body, etc. can be used to measure the location of the user. In other embodiments, the mobile devices are glasses so that real-world head tracking of the opposing player is better measured.

Some embodiments include a system for augmenting video, comprising a video source configured to provide video content to a video display and a mobile device with an integrated video camera and display. The mobile device is configured to track a relative distance and direction of the video display using the video camera, determine a position coordinate of the mobile device using the tracked relative distance and direction, and render, on the integrated display, an object in a position based on the determined position coordinate of the mobile device.

Some embodiments include a method for augmenting video, comprising receiving a first position coordinate corresponding to a first user, the first position coordinate relative to a first video display, receiving a first view direction corresponding to the first user, the first view direction relative to the first video display, and receiving a second position coordinate corresponding to a second user, the second position coordinate relative to a second video display. The method further includes determining a direction and range from the first position coordinate to the second position coordinate and rendering, on an integrated display of a first mobile device, an object based on the determined direction and range from the first position coordinate to the second position coordinate and based on the received first view direction.

Other embodiments relate to machine-readable tangible storage media and computer systems which store or execute instructions for the methods described above.

Some embodiments include a system for augmenting video, comprising a first mobile device having a display, a second mobile device, means for determining a relative direction and range from the first mobile device to the second mobile device, and means for determining a view direction of the first mobile device. The first mobile device is configured to render on its display an avatar or vehicle from a perspective based on the relative direction and range to the second mobile device and view direction of the first mobile device.

BRIEF DESCRIPTION OF THE DRAWINGS

A further understanding of the nature and advantages of the present invention may be realized by reference to the following drawings. In the appended figures, similar components or features may have the same reference label.

FIG. 1 illustrates a first user holding a mobile device at a first position in space relative to a display in accordance with an embodiment.

FIG. 2 illustrates a second user holding a mobile device at a second position in space relative to a display in accordance with an embodiment.

FIG. 3 illustrates a relative direction and range from the user's device of FIG. 1 to the user's device of FIG. 2 in accordance with an embodiment.

FIG. 4 illustrates an avatar displayed as if it were co-located with a second user's mobile device from a vantage point of a first user in accordance with an embodiment.

FIG. 5 illustrates a vehicle avatar displayed as if it were co-located with a second user's mobile device from a vantage point of a first user in accordance with an embodiment.

FIG. 6 illustrates an avatar displayed as if it were co-located with a second user's body from a vantage point of a first user in accordance with an embodiment.

FIG. 7 illustrates a virtual relative direction and range from a first user to a second user in accordance with an embodiment.

FIG. 8 illustrates a screen view of an avatar in the virtual direction and range from the first user to the second user of FIG. 7 in accordance with an embodiment.

FIG. 9 illustrates an off-board camera system for tracking the position of a mobile device in accordance with an embodiment.

FIG. 10 illustrates an on-board camera system for tracking the position of a mobile device in accordance with an embodiment.

FIG. 11 is a flowchart illustrating a process in accordance with an embodiment.

FIG. 12 is an example computer system suitable for use with embodiments of the invention.

The figures will now be used to illustrate different embodiments in accordance with the invention. The figures are specific examples of embodiments and should not be interpreted as limiting embodiments, but rather exemplary forms and procedures.

DETAILED DESCRIPTION OF THE INVENTION

Generally, methods and systems are described for multi-player video games and other interactive video presentations for which augmented video is presented on a user's mobile device display based on the relative position of another user. A user can hold up his device and see an avatar, vehicle, game marker, target crossbars, or other object in the place of where the other user is sitting. In some embodiments, the other user's avatar on the display can move, look, etc. in the same manner as the other user's physical movements. For example, if the other user turns toward the first user, the display will show the avatar turning toward him.

In some embodiments, the users can be located in different rooms across town, but their avatars are rendered on their respective mobile device's screens as if their avatars were seated next to each other in the same room. A common reference point for each of the players can be the center of his or her fixed display.

This description provides examples only, and is not intended to limit the scope, applicability, or configuration of the invention. Rather, the ensuing description of the embodiments will provide those skilled in the art with an enabling description for implementing embodiments of the invention. Various changes may be made in the function and arrangement of elements without departing from the spirit and scope of the invention.

Thus, various embodiments may omit, substitute, or add various procedures or components as appropriate. For instance, it should be appreciated that, in alternative embodiments, the methods may be performed in an order different from that described, and that various steps may be added, omitted, or combined. Also, features described with respect to certain embodiments may be combined in various other embodiments. Different aspects and elements of the embodiments may be combined in a similar manner.

It should also be appreciated that the following systems, methods, and software may individually or collectively be components of a larger system, wherein other procedures may take precedence over or otherwise modify their application. Also, a number of steps may be required before, after, or concurrently with the following embodiments.

FIG. 1 illustrates a first user holding a mobile device at a first position in space relative to a fixed display. A reference frame is defined with origin 104 at the center of fixed display 102 and a polar/cylindrical angle of zero projecting perpendicularly from the plane of the screen. Player 106 (P1) holds mobile device 108 in front of him. The point at the top middle rear of mobile device 108 is reference point 110. The position of reference point 110 is measured, and the coordinates representing the position of reference point 110 in space, (r1, θ1, y1), are stored. For clarity, the figure does not show the third dimensional, vertical measurement, y1. Angle γ1 is P1's view direction or look angle with respect to the fixed frame of reference of the large, fixed display.

A “coordinate” is any of a set of numbers, characters, or symbols used in specifying the location of a point on a one-dimensional line, on a two-dimensional surface, or in three-dimensional space. Coordinates may be orthogonal, such as Cartesian, polar and/or cylindrical, spherical, or non-orthogonal such as those describing a location on the surface of a sphere.

A “view direction” or “look angle” is a direction in space toward which a user's face is pointed or a corresponding user's mobile device is pointed. A view direction can include azimuth and elevation angles relative to the user. A view direction can include a bearing direction in relation to a fixed point.

A mobile device can include a handheld device, such as a Portable Playstation®, a user-worn device, such as glasses with an integrated display, or other electronic devices.

Using the coordinates representing the position and view direction, the mobile display can be used as a secondary display to ‘look around’ the virtual environment. For example, a player driving a virtual tank can slew his mobile device to the left to see enemy troops to the left side outside of the view of the fixed display. As another example, the player can use his mobile device display to zoom into the horizon of the display. The mobile device can act as virtual binoculars to better resolve figures in the distance that might be a threat.

FIG. 2 illustrates a second user holding a mobile device at a second position in space relative to a fixed display. The fixed display may or may not be the same fixed display as in FIG. 1. A reference frame is defined with origin 204 at the center of fixed display 202 and a polar/cylindrical angle of zero projecting perpendicularly from the plane of the screen. Player 206 (P2) holds mobile device 208 in front of her. The point at the top middle rear of mobile device 208 is reference point 210. The position of reference point 210 is measured, and coordinates representing the position of reference point 210 in space, (r2, θ2, y2), are stored. Angle γ2 is P2's view direction with respect to the fixed frame of reference.

FIG. 3 illustrates a relative direction and range from the user's device of FIG. 1 (mobile device 108 of player 106) to the user's device of FIG. 2 (mobile device 208 of player 206). Vector subtracting (r1, θ1, y1) from (r2, θ2, y2) results in (r3, θ3, y3), the direction and range from reference point 110 to reference point 210 with respect to the fixed reference frame from origin 104 (or 204). The distance from reference point 110 to reference point 210 can be calculated as the positive square root of (r3²+y3²). In this embodiment, y3 is zero, and thus the relative distance is simply r3. Subtracting y1 from θ3 results in first view direction β1, and subtracting y2 from θ3 results in second view direction β2.

Although polar/cylindrical coordinates are used here in the examples, other coordinate systems can be used, such as Cartesian and spherical coordinate systems.

FIG. 4 illustrates an avatar displayed as if it were co-located with a second user's mobile device from a vantage point of the first user. Using the relative direction (e.g. β1) and range (e.g. r3) from the first user's handheld device to the second user's handheld device, avatar 414 is rendered on integrated display 112 of mobile device 108. From the vantage point of user 106 (not shown in this figure), avatar 414 in the virtual world appears to overlay the mobile device (occluded in this figure) of user 206 in the real world. Other objects, such as background clouds 416, are rendered with avatar 414. The view from user 206's vantage point is the view on fixed display 102. An overhead view of the positions of the users, mobile devices, and fixed display may be interpreted as that in FIG. 3.

If mobile device 108 is slewed to the right, then avatar 414 disappears off the left side of the display. If mobile device 108 is slewed to the left, then avatar 414 disappears off the right side of the display. In some embodiments, it can appear as if the embedded display is transparent and the view of the room in the background is the same, except for the other player being overlaid with graphics depicting an avatar.

FIG. 5 illustrates vehicle 514 displayed as if it were co-located with a second user's mobile device from a vantage point of the first user. From the vantage point of user 106 (not shown in this figure), vehicle 514 in the virtual world on display 112 of mobile device 108 appears to overlay the mobile device (occluded in this figure) of user 506 in the real world.

FIG. 6 illustrates avatar 614 displayed as if it were co-located with second user's body 206 from a vantage point of the first user 106 (not shown in this figure). Background object 616, a pyramid in the desert sand, is displayed on integrated display 112 of mobile device 108. Using predefined models of how a majority of users hold their mobile devices, an estimate of where the holder's head, body, etc. is located in relation to a reference point on the mobile device can be used to render an avatar so that it appears to better portray the actual position of the user. For example, the bridge of a user's nose may be estimated to be 14 inches away along a line extending perpendicularly from the center of the integrated display or a user's controller that does nor have an integrated display. This offset can be used to shift the avatar's head to this position. The rest of the avatar's body can be filled downward to the ground. In some embodiments. facial and motion tracking can be used to track the user's body directly.

FIG. 7 illustrates a virtual relative direction and range from a first user to a second user. Second user 206 can be made to appear as a mirror or 180° rotated image through the center of fixed display 102. Using vector addition and subtraction, a virtual direction β4 and virtual range r4 can be calculated such that opposing player 206 appears to be across from first user 106. If the opposing player steps to forward to move toward the left of his screen (see figure), the display on player 106's mobile device 108 will show player 206's avatar move right.

This mirrored movement can be useful to simulate games in which players play across from one another, such as tennis, handball, chess, etc. This can be used by players in the same room with the same, central fixed display or by players in different rooms with their own displays.

FIG. 8 illustrates a screen view of an avatar in the virtual direction and range from the first user to the second as shown in FIG. 7. As player 206 physically moves in front of his fixed display, player 106 (not shown in this figure) sees avatar 814 representing player 206 move across the display on the integrated display of mobile device 108. If mobile device 108 is moved, the tennis court, avatar 814, and other elements of the view move oppositely so that it appears that the virtual world is inertially stabilized with respect to the real, physical world.

FIG. 9 illustrates an off-board camera system for tracking the position of a mobile device. Video camera 920 sits in a convenient, fixed position atop fixed display 102 and tracks mobile device 908 using infrared, radio frequency, visible light, or other suitable methods. For example, video camera 920 may track a piece of reflective tape on mobile device 908.

Camera 920 can also be enabled to track faces as is known in the art. Facial tracking technology can work to directly determine the position and view direction of a player's head, eyes, nose, etc. A camera on mobile device 908 can also be used to track the player's head.

Video game console 922 connects to camera 920 and fixed display 102. Video game console connects wirelessly, through wireless port 924, with mobile device 908 through wireless link 926. Wireless link 926 can be radio frequency, infrared, etc. The camera may output the position of tracked objects to console 922, or the camera may output raw video to console 922 and console 922 processes the raw video to determine the position, velocity, etc. of tracked objects.

Console 922 can send the coordinates of the tracked objects to mobile device 908 along with the determined view direction of mobile device 908. Mobile device 908 can then use the coordinates and view direction to render an avatar in the correct position on its screen.

In some embodiments, wireless link 926 can be used to send remote control-like commands to the video display. For example, a cellular phone can be used to turn up or down the volume on a television.

FIG. 10 illustrates an on-board camera system for tracking the position of a mobile device. Mobile device 1008 includes video camera 1020. Video camera 1020 tracks the rectangular screen of display 102, markers on the screen, or markers off the screen, such as infrared sources as known in the art. Markers on the screen can be in the corners of the screen and be rendered at a predetermined frequency so that mobile device 1008 can positively track the screen. The markers can include bar codes, two-dimensional codes, or be modulated in time to send information from fixed display 102 to mobile device 1008. Console 922 can send the coordinates of the opposing user's mobile device to mobile device 1008 through wireless port 924 and wireless link 926, and mobile device 1008 can use those coordinates, along with its internally determined coordinates and view direction, to render an avatar in the correct position on its screen. A camera on mobile device 1008 facing the player can also be used to track the player's head.

The position of mobile device 1008 can be used as an input to a video game. For example, a user can pace around his living room floor, marking locations where she will have her battleships for a virtual board game of Battleship®. In another example, a virtual game of ‘Marco Polo’ can be played in which players attempt to guess the location of other players without the use of their eyes. A player could move around his T.V. room in order to simulate his virtual position on a field or in a pool.

In other embodiments, the mobile device can automatically determine its position and view direction using a Global Positioning System (GPS) receiver, accelerometer-based inertial system, mechanical or solid-state gyroscope, electronic magnetic compass, radio frequency triangulation, and/or other methods known in the art.

FIG. 11 shows an example flowchart illustrating process 1100 in accordance with one embodiment. This process can be automated in a computer or other machine and can be coded in software, firmware, or hard coded as machine-readable instructions and run through one or more processors that can implement the instructions. In operation 1102, a first position coordinate corresponding to a first user is received, the first position coordinate being relative to a first video display. In operation 1104, a first view direction corresponding to the first user is received, the view direction being relative to the first video display. In operation 1106, a second position coordinate corresponding to a second user is received, the second position coordinate being relative to a second video display. In operation 1108, a direction and range from the first position coordinate to the second position coordinate are determined. In operation 1110, an object is rendered, on an integrated display of a first mobile device, based on the determined direction and range from the first position coordinate to the second position coordinate and based on the received first view direction. These operations may be performed in the sequence given above or in different orders as applicable.

FIG. 12 illustrates an example of a hardware system suitable for implementing a device in accordance with various embodiments. This block diagram illustrates a computer system 1200, such as a personal computer, video game console and associated display (e.g., video game console 922 and fixed display 102 of FIG. 9, mobile device (e.g., mobile device 108 of FIG. 1), personal digital assistant, or other digital device, suitable for practicing embodiments of the invention. Computer system 1200 includes a central processing unit (CPU) 1205 for running software applications and optionally an operating system. CPU 1205 may be made up of one or more homogeneous or heterogeneous processing cores. Memory 1210 stores applications and data for use by the CPU 1205. Storage 1215 provides non-volatile storage and other computer readable media for applications and data and may include fixed disk drives, removable disk drives, flash memory devices, and CD-ROM, DVD-ROM, Blu-ray, HD-DVD, or other optical storage devices, as well as signal transmission and storage media. User input devices 1220 communicate user inputs from one or more users to the computer system 1200, examples of which may include keyboards, mice, joysticks, touch pads, touch screens, still or video cameras, and/or microphones. Network interface 1225 allows computer system 1200 to communicate with other computer systems via an electronic communications network, and may include wired or wireless communication over local area networks and wide area networks such as the Internet. An audio processor 1230 is adapted to generate analog or digital audio output from instructions and/or data provided by the CPU 1205, memory 1210, and/or storage 1215. The components of computer system 1200, including CPU 1205, memory 1210, data storage 1215, user input devices 1220, network interface 1225, and audio processor 1230 are connected via one or more data buses 1235.

A graphics subsystem 1240 is further connected with data bus 1235 and the components of the computer system 1200. The graphics subsystem 1240 includes a graphics processing unit (GPU) 1245 and graphics memory 1250. Graphics memory 1250 includes a display memory (e.g., a frame buffer) used for storing pixel data for each pixel of an output image. Graphics memory 1250 can be integrated in the same device as GPU 1245, connected as a separate device with GPU 1245, and/or implemented within memory 1210. Pixel data can be provided to graphics memory 1250 directly from the CPU 1205. Alternatively, CPU 1205 provides the GPU 1245 with data and/or instructions defining the desired output images, from which the GPU 1245 generates the pixel data of one or more output images. The data and/or instructions defining the desired output images can be stored in memory 1210 and/or graphics memory 1250. In an embodiment, the GPU 1245 includes 3D rendering capabilities for generating pixel data for output images from instructions and data defining the geometry, lighting, shading, texturing, motion, and/or camera parameters for a scene. The GPU 1245 can further include one or more programmable execution units capable of executing shader programs.

The graphics subsystem 1240 periodically outputs pixel data for an image from graphics memory 1250 to be displayed on display device 1255. Display device 1255 can be any device capable of displaying visual information in response to a signal from the computer system 1200, including CRT, LCD, plasma, and OLED displays. Computer system 1200 can provide the display device 1255 with an analog or digital signal.

In accordance with various embodiments, CPU 1205 is one or more general-purpose microprocessors having one or more processing cores. Further embodiments can be implemented using one or more CPUs with microprocessor architectures specifically adapted for highly parallel and computationally intensive applications, such as media and interactive entertainment applications.

The components of the system 108 of FIG. 1 and system 208 of FIG. 2 may be connected via a network, which may be any combination of the following: the Internet, an IP network, an intranet, a wide-area network (“WAN”), a local-area network (“LAN”), a virtual private network (“VPN”), the Public Switched Telephone Network (“PSTN”), or any other type of network supporting data communication between devices described herein, in different embodiments. A network may include both wired and wireless connections, including optical links. Many other examples are possible and apparent to those skilled in the art in light of this disclosure. In the discussion herein, a network may or may not be noted specifically.

It should be noted that the methods, systems, and devices discussed above are intended merely to be examples. It must be stressed that various embodiments may omit, substitute, or add various procedures or components as appropriate. For instance, it should be appreciated that, in alternative embodiments, the methods may be performed in an order different from that described, and that various steps may be added, omitted, or combined. Also, features described with respect to certain embodiments may be combined in various other embodiments. Different aspects and elements of the embodiments may be combined in a similar manner. Also, it should be emphasized that technology evolves and, thus, many of the elements are examples and should not be interpreted to limit the scope of the invention.

Specific details are given in the description to provide a thorough understanding of the embodiments. However, it will be understood by one of ordinary skill in the art that the embodiments may be practiced without these specific details. For example, well-known circuits, processes, algorithms, structures, and techniques have been shown without unnecessary detail in order to avoid obscuring the embodiments.

Also, it is noted that the embodiments may be described as a process which is depicted as a flow diagram or block diagram. Although each may describe the operations as a sequential process, many of the operations can be performed in parallel or concurrently. In addition, the order of the operations may be rearranged. A process may have additional steps not included in the figure.

Moreover, as disclosed herein, the term “memory” or “memory unit” may represent one or more devices for storing data, including read-only memory (ROM), random access memory (RAM), magnetic RAM, core memory, magnetic disk storage mediums, optical storage mediums, flash memory devices, or other computer-readable mediums for storing information. The term “computer-readable medium” includes, but is not limited to, portable or fixed storage devices, optical storage devices, wireless channels, a sim card, other smart cards, and various other mediums capable of storing, containing, or carrying instructions or data.

Furthermore, embodiments may be implemented by hardware, software, firmware, middleware, microcode, hardware description languages, or any combination thereof. When implemented in software, firmware, middleware, or microcode, the program code or code segments to perform the necessary tasks may be stored in a computer-readable medium such as a storage medium. Processors may perform the necessary tasks.

Having described several embodiments, it will be recognized by those of skill in the art that various modifications, alternative constructions, and equivalents may be used without departing from the spirit of the invention. For example, the above elements may merely be a component of a larger system, wherein other rules may take precedence over or otherwise modify the application of the invention. Also, a number of steps may be undertaken before, during, or after the above elements are considered. Accordingly, the above description should not be taken as limiting the scope of the invention. 

1. A system for augmented video, the system comprising: a video source configured to provide video content to a video display; and a mobile device with an integrated video camera and display, the mobile device configured to: track a relative distance and direction of the video display using the video camera; determine a position coordinate of the mobile device using the tracked relative distance and direction; and render, on the integrated display, an object in a position based on the determined position coordinate of the mobile device.
 2. The method of claim 1 wherein the video source and mobile device are configured to execute a video game, the position coordinate input to the video game.
 3. The method of claim 1 wherein the mobile device is configured to control the video display.
 4. A method for augmenting video, comprising: receiving a first position coordinate corresponding to a first user, the first position coordinate relative to a first video display; receiving a first view direction corresponding to the first user, the first view direction relative to the first video display; receiving a second position coordinate corresponding to a second user, the second position coordinate relative to a second video display; determining a direction and range from the first position coordinate to the second position coordinate; and rendering, on an integrated display of a first mobile device, an object based on the determined direction and range from the first position coordinate to the second position coordinate and based on the received first view direction.
 5. The method of claim 4 wherein the object is displayed as if it were co-located with the second user from a vantage point of the first user.
 6. The method of claim 4 further comprising: receiving a second view direction corresponding to the second user, the second view direction relative to the second video display, wherein the rendering is further based on the received second view direction.
 7. The method of claim 6 wherein the object is selected from the group consisting of an avatar and a vehicle.
 8. The method of claim 7 wherein the avatar or vehicle is rendered to face in the second view direction.
 9. The method of claim 4 further comprising: estimating a position of the second user's head, wherein the rendering of the object is further based on the estimate of the position of the second user's head.
 10. The method of claim 4 wherein the position coordinates corresponding to the users are estimates of where the users' heads or hands are.
 11. The method of claim 4 wherein the position coordinates corresponding to the users are position coordinates of mobile devices worn by the users.
 12. The method of claim 4 wherein determining the direction and range from the first position coordinate to the second position coordinate comprises co-locating and aligning the first and second frames of references.
 13. The method of claim 4 wherein the position coordinates are of a type selected from the group consisting of Cartesian, polar or cylindrical, and spherical.
 14. The method of claim 4 wherein the first view direction comprises an azimuth and elevation.
 15. The method of claim 4 wherein the first and second video displays are the same display.
 16. The method of claim 4 wherein the receivings, determining, and rendering are performed in the order recited.
 17. A system for augmenting video, comprising: a first mobile device having a display; a second mobile device; means for determining a relative direction and range from the first mobile device to the second mobile device; and means for determining a view direction of the first mobile device; wherein the first mobile device is configured to render on its display an avatar or vehicle from a perspective based on the relative direction and range to the second mobile device and view direction of the first mobile device.
 18. The system of claim 17 further comprising: means for determining a pointing direction of the second mobile device, wherein the first mobile device is further configured to render on its display the avatar or vehicle facing a direction based on the pointing direction of the second mobile device.
 19. The system of claim 17 wherein the first mobile device comprises glasses having an integrated display in at least one lens of the glasses.
 20. The system of claim 17 wherein the means for determining the relative direction and range from the first mobile device to the second mobile device comprise means off-board the first mobile device. 